A new Google Glass app called Watch Your Privacy lets wearers know if there are surveillance cameras around them and lets them create their own “safe zones” where they can steer clear of the view of these cameras.

Developed by Dutch new media artist Sander Veenhof, the app uses open data from surveillance cameras around the world to locate cameras. The app also maps other Google Glass users in the area as well.

The app marks the surveillance camera it detects with a triangular sign pointing to it. It also marks the approximate coverage area of the camera. Wearers can configure their privacy preferences by specifying “safe” and “non-safe” zones.

To use the app, wearers need to download the Layar augmented reality browser on their Glass or smartphone.